A method and apparatus for a fast handover of a link with a communications unit between a first and a second wireless communications network includes a receiving device (203, 231) for receiving signals from a first and a second wireless communications network (106, 120), a controller (207) for detecting...http://www.google.es/patents/US7266101?utm_source=gb-gplus-sharePatente US7266101 - Fast handover through proactive registration
